Punching-machine



narran stares raras@ carica J OHN A. BRADSHAY AND A. FRANK COLBY, OFLOWELL, MASSACHUSETTS.

PUNCHING-MACHINE.

Specification of Letters Patent No. 29,281, dated July 2,4, 1860.

T o all whom it may concern.'

Be it known that we, JOHN A. BRADsHAw and A. FRANK COLBY, both ofLowell, in the county of Middlesex and Commonwealth of Massachusetts,have invented certain new and useful Improvements in Punching-Machines;and we do hereby declare that the following is a full, clear, and exactdescription of the construction and operat-ion of the same, referencebeing had to the accompanying drawings, making part of thisspecification, and to the letters of reference marked thereon.

Figure l, is a plan or top view of our machine. Fig. 2 is a sideelevation. Fig. 3 is a longitudinal vertical section of the same,through ai, y.

Similar letters of reference in each of the several figures, refer tolike parts.

A, is the bed piece or frame, to which the working parts are attached.

B, is the main shaft. The cam O, on the main shaft operates the lever D,which lever, moves the sliding plate E, carrying the con centric punchesF and G, up and down. The cam C, is a double cam having one of itsthrows greater than the other, and as it revolves, the lesser throwoperates the small punch F (in manner hereafter described) which punchesthe hole in the nut or washer. Then comes a rest in the cam, whichallows time to move the die plate H, forward, so that the matrice J,shall come under the punch G. The larger throw in the cam then forcesthis punch down and cuts out the external shape of the nut or washer, atthe same time stripping the nut or washer from the small punch. Thereare two necessary adjuncts to make this operation complete. l One is thewedge L, operated by the lever M. This wedge is inserted at the righttime over the top of the small punch so as to cause it to projectthrough the large punch far enough to punch the small hole in the plate,without having the large punch come in contact with the plate. Then whenthe die plate moves forward, the lever M, being attached to it,withdraws the wedge, and leaves the punch F loose, while the punch G, isdoing its duty. The other adjunct is the lever I, operated by the cam K.This lever holds the small punch F (after it has punched the core, andis slightly removed from the die, so as to admit of its passage) near tothe surface of the die plate H, so that the plate which is beingpunched,

shall not be disengaged from F until the die plate has changed itsposition, and the large punch has begun to operate.

The apparatus that moves the die plate back and forth is as follows: N,is a connecting rod, which connects the die plate with a crank shaft O.The pinion P operated by the sectional gear Q turns this shaft, and theset plate R, attached to shaft O, prevents the shaft from turning whenthe pinion is out of gear. The sectional gear Q has two sections ofteeth, which occupy the same number of degrees in the circumference thatis occupied by the two resting spaces in the cam C, so that While thepunches are at rest, the section of teeth in gear Q turns the pinion P,half round, and moves the die plate forth or back as the case may be,and then the set rim (vg) of the sectional gear, enters the concavity(c) of the set plate, and holds the die plate securely and exactly inits place while the punch is performing its duty.

The apparatus for feeding the bars or plate to be punched, is asfollows: R', is another sectional gear having only one section of teeth;these are arranged so as to move the pinion S, just after the last punchis given to the nut or washer; and while the die plate is moving so asto bring the small hole under the-punch. The pinion S, communicatesmotion to the feed rolls T, T', by means of gear U, pinion V, conepulleys X, Y, bevel gears Z, Z', and spur gears (a, The feed isregulated to 'suit different sizes of nuts or washers by adjusting thebelt on the cone pulleys X, Y. The upper feed roll T', is held down by aweight or spring so that it may accommodate itself to the differentthicknesses of iron.

The contrivance for separating the cores from the nuts or washers afterthey are punched, is as follows: is a double inclined plane connected tothe die plate, between the two matrices, and the cores falling againstone side of the inclined plane, shoot into the apartment (c), while thenut or washer falling against the other side of the inclined plane,shoot into the apartment Having thus described our invention what weclaim as new and desire to secure by Letters Patent isl. The shiftingdie in combination with the concentric punches, operated in mannersubstantially as and for the purpose described.

2. The combination of the Wedge L, and out signatures this ninth day ofMay in the l0 punch Fin manner substantially as and for year of our Lordeighteen hundred and the pu'lpose set forth. d 1 sixty.

3. T e double incline p ane d or 1 5 equivalent, for the purpose andsubstantially 1 as described.

4. The feed rolls T, T, operated in the In presence of- Inanner andsubstantially as described. ALPHoNso DICKERMAN,

In Witness whereof We have hereunto Set O. E. CUSHING.

